Description.
This circuit is designed as per a request made by Mr Vinoth from India. His requirement was a 12V/5A DC fan motor controller. I think this circuit is sufficient for this purpose. Quad 2 input Schmitt trigger IC CD4093 is the heart of this circuit. Out of the four Schmitt triggers inside the 4093, U1a is wired as an oscillator with adjustable duty cycle. The U1b, U1c, U1d buffers the output of the oscillator to drive the switching MOSFET Q1.The MOSFET drives the DC motor according to the switching pulse obtained from the oscillator. When R1 is varied the duty cycle varies and so do the speed of the motor. Diode D3 acts as a freewheeling diode.

Circuit diagram with Parts list.

Notes.

Assemble the circuit on a good quality PCB.

IC U1 should be mounted on a holder.

U1a, U1b, U1c, U1d are part of the same IC CD4093; so power supply is shown connected only once.

The12V power supply for this circuit must be able to handle at least 5A.

I have assembled the circuit of fan regulator. I have put IRFP150 as mosfet. I am facing problem of mosfet heating up. my DC supply is 18 Volts and for CD4093 it is 12 DC. Can you help to solve the problem?

Hi.. We are un employed engineering graduate.. In my team we are four member are trying to selfemployed our self. We are trying to impliment our ideas with some product.. For we need your help… We need 40 Amp dc motor drive for our product.. If u do this mean four people will get sure they lives.. So please try to help us and try to design a circuit for our requirnment.

Hi, what changes would need to be made to control a 24 volt 900 watt dc brushed motor? If you can help buy giving me a wiring diagram and a parts list that would be great. Im new to motor controls and could use some help and fast! Thanks

sir
actually i made a fan and its work fine with 3 amp 12 v transformer but when electricity have no , i wanna to drive its from 12/24 volt 15 amp of battery , my motor required 12 v 3 amp so please give me a circuit with available parts from run this 3 amp 12 v motor on 12 volt 15 amp of current

Hi
Please would you be good enough to send me a schematic drawing and a list of components required for a speed controller, Which I would like to add to my wood turning lathe.
The motor is 230v 1000w AC, if possible with a reverse.
Brian

Sir,
I am having the below mentioned phone set which went out of order recently, i tried to get the circuit diagram and other service manual to get this repaired. Unfortunately i did’t get it. will you please me help me in this regard any cost i am ready to pay also.

1. I am having Nokia make cordless telephone which is went out of order few months back the details of which or as follows:
Long Range Cordless Telephone Model NK 6150 CID
(FSK/DTMF CALLER ID) Made in Finland.

Admin,
I need a circuit to control the speed of a 230/240V dc motor, (separately excited field and rotor windings) which is driving an AC alternator. (need speed control to maintain accurate frequency on ac !)
Please help

I am using an owi 007 robot arm and I am trying to control it with a 2 phase dc motor with pwm and a dragon 12 board. The owi 007 robot arm has 5 dc motors that are each powered with 1.5V D batteries (1.5V power supply). Should I use a similar schematic in comparison with yours? If not, then what should I do?

can u pls design nd telme the operation of..”a tamperature controlled..as well as…..remote and manually operatable elctronic regulator”..connected to the same circuit for a single phase fan of “230volts..a.c” i suppose the current rating is 4 to 6 amps..i.e power rating of my fan is “750 to 1150 watts”..!!
this circuit designed should be..applicable for high power rating of fans [like cooling purpose fans used in industries] …also ..by proportationately increasing the…rating og electronic..components used in it!!..!! plz…provide ma the details..